A storage system that does not lose data when power is removed from it. Intended to refer to core, ROM, EPROM, flash memory, bubble memory, or battery-backed CMOS RAM, the term is occasionally used in reference to disk subsystems as well.

Memory that retains the information stored in it even if you turn off the computer. There are two kinds: ROM and NVRAM. ROM is programmed with information at the factory, and you can't change it. NVRAM is used to store configuration information, and you can changed it with modem commands.

User-programmable random access memory whose data is retained when device power is turned off. NVRAM is used in USRobotics modems to store a user-defined default configuration. This data is loaded into random access memory (RAM) at power on.

A general term for all forms of solid state (no moving parts) memory that do not lose their contents when the power source is removed. This includes all forms of read-only memory (ROM) such as programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, and flash memory.